The Equinox is available at: Stefan AudioArt Home
The Zu Mobius: Mobius Sennâ„¢ Mk2 Sennheiser Headphone Cable
The A Pure Sound: APureSound - Where The Music Is Always Pure - APS Audio LLC.
The Moon Audio Silver or Black Dragon: Headphone Cable
I heard the Silver or Black Dragon and Equinox keeps the HD650's sonic signature but improves it. The Zu Mobius tends to make it brighter and makes big changes the HD650's sound.
I just ordered the Black Dragon because I like the HD650's sound but wanted a bigger soundstage, more 3D sound. And also because it's the cheapest of them all. I don't want to pay over $200 for a 5 ft cable.
EDIT: I should clarify that by cheapest, I don't mean bad quality or sound. From the reviews I read here, the Moon Audio Silver Dragon and Black Dragon are very well made and sound amazing.
just wondering how much the black dragon 5ft cable cost you? on the site it simply says "SOLD OUT" wondering how much it costs...